For comfort and health in wintertime, your home's humidity should be between 35%-55%. If your home is not equipped with a humidifier, the amount of moisture in the air is likely to be 2/3 less than the proper amount needed to be comfortable. If you add moisture to the air, you can be comfortable at a lower temperature.
By installing a humidifier you will not only keep your home energy efficient by using your furnace less, you can also correct the condition that causes dry skin and problems with furniture and other household furnishings. If your furnace has an evaporate-plate humidifier, it may need occasional cleaning to prevent a build-up of mineral deposits.